Magnetic separator



F. UHLIG.

MAGNETIC SEPARATOR. APPLICATION FILED MAR.16. 1920.

1 1,371,825; Patented Mar. 15, 1921.

UNITED STATES:

PATENT OFFICE.

FRANZ UHLIG, OF BERLIN, GERMANY.

MAGNETIC summon Specification of Letters Patent. Patented .Mar, 1921 Application filed March 16,1920. Serial No. 366,413.

To all whom it may concern Be it known that I FRANZ UHLIG, a citizen of the German Republic, residing at Berlin, Germany, have invented certain new and useful Improvements in and Relating to Magnetic Separators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and 4 use the same.

My invention relates to magnetic separators and has for its object to provide an improved form of separator in'which the magnet is so placed that the separation of the attracted bodies is facilitated, automatic means being also provided for receiving the attracted bodies when released from the magnet by interruption of the current and for preventing them from falling into the machine into which the material from the separator passes.

In carrying out the invention the apparatus is so arranged that the raw material falls directly on to or in close proximity to the magnet in a stream, the magnet thus having to deviate the attracted bodies from their course only instead of attracting them against their own weight as heretofore.

To receive the separated bodies adhering to the magnet which fall on interruption of the current, a receiver is provided which may be in the form of a basket or wagon arranged on an inclined plane and normally held out of operation by means of an armature in contact with the magnet. On interruption of the current thereceiver is released and moves into operative position beneath the magnet, the movement of the receiver being arranged so that it reaches its position in time to catch the bodies which fall from the magnet on interruption of the current and thus prevents them from falling into the machine which the separator is feeding, as hereinafter described.

To enable the invention to be fully understood it will now be described by reference to the accompanying drawing in which a sectional view in side elevation ofone form of separator constructed according to the lIlVBl'ltluIl is shown.

As shown, a indicates the magnet, a is the hopper for the raw material which is so arranged that the latter falls in a stream in close proximity to the magnet whereby the work of separating magnetic bodies is considerably facilitated, since the magnet only has to deviate them from their ,path and not to attract them againsttheir own weight. The raw material'after leaving the hopper 0 falls through the channel I). To receive the separated objects on interruption of the current the following arrangement is provided:

A wagon d is arran ed on rails 6 formmg an inclined plane t shown).

The normal position of the Wagon'is indicated at f, and is held in this position by means of an armature g which is held at the pomt m by the attraction of the magnet (1. The connection between the wagon d and armature g is effected most simply by means of a rope h which passes over rollers Z0 and z'. The armature g which also acts as a counterweight for the wagon is preferably arranged to slide in the tubular member 9.

With this arrangement it will be obvious that when the current is interrupted the armature g" is released from the magnet a whereupon the wagon d owing to its own weight .will roll down the, inclined plane e, and Wlll arrlve at its operative position within the channel I).

But since by interrupting the'current the separated articles are also released from the magnet it might happen that these will drop before the wagon arrives in its operative position and so fall into other parts of the machine.

In order to obviate this, the armature q is arranged at a point m on the magnet a, which Is so chosen that on the interruption of the current the demagnetization takes place more quickly at that point than at that part of the magnet to which the separated bodies adhere. For this purpose a polnt is selected atwhich the magnetic field is less dense than it isat the poles Z of the magnet, As shown in the present example this point m for the armature g is chosen near the coil at which point the magnetic field is considerably weaker than at the poles Z of the magnet.

Naturally the difference in the speed of demagnetization between the point m and the point Z, plays no part if the distance between the magnet and the wagon is, rela- In order that the released articles shall not fall in the'ne'ighborhood of the walls of Y the channel 12 and so jam between the wagon and these walls, a funnel-like framework 41. is provided as shown. It will be understood that the stream of material is stopped before the magnet is deenergized, but 1t will be understood also that thls stop ing of the nia-. terial will not be essential with all kinds of materials, since it would obviously be pos- -'sible to arrange the gravity-car up closer to the magnet and stop it short of the stream of material and thus permit the stream of material to continue during the very short period that would be required to clear the armature or'poles of the magnet.

In the drawing is diagrammatically shown a circuit 1) for the field magnets, in which is inserted a simple interrupter switch consisting of a movable contact 1 having a handle 9. When the contact p is moved to the left, as shown in dotted lines, it touches a contact .9 to thus allow current to flow through themagnetwindings. When the contact arm p is shifted to the right, the current is interrupted and the demagnetization takes place. Movement of the contact ;0 to the right 1s limited by stop 1".

Having now particularly described and ascertained the nature of my said invention and'in what manner the same is to be performed, I declare that what I claim is:

1. In a separator, an extracting electromagnet and a circuit for energizing the same, a receiver for the extracted articles, and

. means whereby the denergization of the magnet causes the'receiver to move to receiving position.

2. In a separator, an extracting electromagnet and a circuit for energizing the same,

a receiver for the extracted articles, and

means whereby the denergization of the magnet causes the receiver to move to receiving position, said receiver being arranged to gravltate into receiving osition when released by deenergization oi the magnet.

3. In a separator, an extracting electromagnet and a circuit for energizing the same,

a receiver for the extracted articles, and

means whereby the deenergization of the magnet causes the receiver to move to rea tray mounted on an inclined trackway to there y gravitate into receiving position when released by denergization of the magnet.

4. In a separator, an extracting electromagnet and a circuit for energizing the same, a receiver for the extracted articles, and means whereby the denergization of the magnet causes the receiver to move to receiving position, said means embodying ,a receiver adapted to automatically assume receiving position when released and an armature-holding-olevice for the receiver adapted to be released upon defe'nergization of the extracting magnet.

In a separator, an extracting electromagnet and a circuit for energizing the same, a receiver for the extracted articles, and means whereby the deenergization of the magnet causes the receiver to move to receiving position, said means embodying a receiver adapted to automatically assume receivlng position when released and anarmature-holding-device for the receiver adapted to be released upon deenergization of the extracting magnet, the armature being at a point of attraction of the magnet at which demagnetization takes place more rapidly than at the poles where the extracted articles are held, so that the receiver arrives at receiving position in time to catch the released articles.

6. In a separator, an extracting electromagnet and a circuit for energizing the same, a receiver for the extracted articles, and means whereby the deenergization of the magnet causes the receiver to move to receiving position, said receiver consisting of a tray mounted on an inclined track so as to automatically assume receiving position ceiving position, said receiver consisting. of

when released, and a holding and releasing 

